//
//  UserAccount.swift
//  Microblog
//
//  Created by steaest on 15/7/31.
//  Copyright © 2015年 steaest. All rights reserved.
//

/**
1.直接把字典转成 plist 存储
2.将字典转换成json保存(越来越普遍)
3.归档解档
4.SQLite
*/

import UIKit

//用户模型
class UserAccount: NSObject, NSCoding {
    
    //用户是否登录标记
    class var userLogon: Bool {
        return sharedAccount != nil
    }
    
    //用于调用access_token，接口获取授权后的access token。
    var access_token: String?
    //access_token的生命周期，单位是秒数
    var expires_in: NSTimeInterval = 0 {
        didSet {
            expiresDate = NSDate(timeIntervalSinceNow: expires_in)
        }
    }
    //过期日期
    var expiresDate: NSDate?
    //当前授权用户的UID
    var uid:String?
    
    //友好显示名称
    var name: String?
    //用户头像地址(大图) 180*180像素
    var avatar_large: String?
    
    
    
    init(dict: [String: AnyObject]) {
        super.init()
        setValuesForKeysWithDictionary(dict)
        expiresDate = NSDate(timeIntervalSinceNow: expires_in)
        
        UserAccount.userAccount = self
    }
    
    //防模型丢失报错
    override func setValue(value: AnyObject?, forUndefinedKey key: String) { }
    
    //对象描述信息
    override var description: String {
        
        let properties = ["access_token", "expires_in", "uid","expiresDate","name","avatar_large"]
        return "\(dictionaryWithValuesForKeys(properties))"
    }
    
    /**
    如果没有登录,返回空
    如果Token过期,返回空
    */
    private static var userAccount: UserAccount?
    static var sharedAccount: UserAccount? {
        if userAccount == nil {
            userAccount = NSKeyedUnarchiver.unarchiveObjectWithFile(accountPath) as? UserAccount
        }
        if let date = userAccount?.expiresDate where date.compare(NSDate()) == NSComparisonResult.OrderedAscending {
            
            //如果过期删除账号重新登录
            userAccount = nil
        }
        return userAccount
    }
    
    
    //MARK:加载用户信息
    //虽然两个方法同名,但是但是在不同类中职责不一样,在本类中负责 异步获取用户信息,保存当前用户信息
    func loadUserInfo(finished: (error: NSError?)->()) {
        NetworkTools.sharedTools.loadUserInfo(uid!) { (result, error) -> () in
            if error != nil {
                finished(error: error)
                return
            }
            
            self.name = result!["name"] as? String
            self.avatar_large = result!["avatar_large"] as? String
            
            self.saveAccount()
            
            finished(error: nil)
            
            print(self)
        }
    }
    
    //MARK:- 归档 & 解档的方法
    //保存归档文件路径
    static private let accountPath = NSSearchPathForDirectoriesInDomains(NSSearchPathDirectory.DocumentDirectory, NSSearchPathDomainMask.UserDomainMask, true).last!.stringByAppendingPathComponent("account.plist")
    
    //保存用户账号
    func saveAccount() {
    
        NSKeyedArchiver.archiveRootObject(self, toFile: UserAccount.accountPath)
        print(UserAccount.accountPath)
    }
    
    
    //MARK: NSCoding
    //归档,将自定义对象转换成二进制数据保存到磁盘
    func encodeWithCoder(aCoder: NSCoder) {
        aCoder.encodeObject(access_token, forKey: "access_token")
        aCoder.encodeDouble(expires_in, forKey: "expires_in")
        aCoder.encodeObject(expiresDate, forKey: "expiresDate")
        aCoder.encodeObject(uid, forKey: "uid")
        aCoder.encodeObject(name, forKey: "name")
        aCoder.encodeObject(avatar_large, forKey: "avatar_large")
    }
    ////解档,将二进制数据从磁盘恢复成二进制数据
    required init?(coder aDecoder: NSCoder) {
        access_token = aDecoder.decodeObjectForKey("access_token") as? String
        expires_in = aDecoder.decodeDoubleForKey("expires_in")
        expiresDate = aDecoder.decodeObjectForKey("expiresDate") as? NSDate
        uid = aDecoder.decodeObjectForKey("uid") as? String
        name = aDecoder.decodeObjectForKey("name") as? String
        avatar_large = aDecoder.decodeObjectForKey("avatar_large") as? String
    }

}
